Diplocystis oxycani n.sp.

Sporocyst. (Plate 1, fig. 1). Length 13 μ, width 6μ, elliptical with truncate ends, more nearly ovoid than bi-conical.

Sporozoite. Eight per sporocyst, long, thin, transparent, as long as sporocyst. Slightly blunter at one end. Movements undulating.

Trophozoite. (Plate 1, fig. 2). Attached to external wall of intestine, large, opaque white, pyriform. Later, when free in body cavity, spherical. These latter when dissected show a prominence on the circumference which is probably the remains of the epimerite. Nucleus large with a single spherical endosome or karyosome 16 μ in diameter.

Gametocyst. Ovoid to sub-spherical, opaque white, 1·7 to 2·0 mm. in diameter.

Gametes. These have not been studied sufficiently to state whether or not they are differentiated into micro- and macrogametes.